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Centrality dependence of subthresholdϕmeson production in Ni + Ni collisions at1.9AGeV
Piasecki, K.,Tymiń,ski, Z.,Herrmann, N.,Averbeck, R.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Benabderrahmane, M. L.,Berger, M.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Crochet American Physical Society 2016 Physical Review C Vol.94 No.1
<P>We analyzed the phi meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6 +/- 1.6(stat) +/- 1.5(syst)] x 10(-4). This new data point allows us for the first time to inspect the centrality dependence of subthreshold phi meson production in heavy-ion collisions. The rise of phi meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent alpha = 1.8 +/- 0.6. The ratio of phi to K- production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36 +/- 0.05.</P>
Measurement of the In-MediumK0Inclusive Cross Section inπ−-Induced Reactions at1.15 GeV/c
Benabderrahmane, M. L.,Herrmann, N.,Wiś,niewski, K.,Kecskemeti, J.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Deppner, I.,Crochet, P.,Dup American Physical Society 2009 Physical Review Letters Vol.102 No.18
<P>The K0 meson production by pi(-) mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at the Schwer-Ionen-Synchrotron accelerator of GSI. Inclusive production cross sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN potential of 20+/-5 MeV at normal nuclear matter density.</P>